Sources: various
Unreached of the Day
Join thousands of people worldwide praying for a different unreached people group each day. The app delivers a daily profile with background, population, and prayer points, available in nine languages for iOS and Android.
31 Frontier People Groups
Pray each day of the month for the 31 largest frontier people groups: the least reached unreached groups, each with less than one-tenth of one percent of the population following Jesus.
Pray for Eurasia
Pray for an 178 unreached people groups across Europe and Asia throughout the year. The app has a new look and is now available in 10 languages (promo materials, too).
Check your app store for these or follow links from Joshua Project.
Finally, one more tip, and this one needs no app.
Mission mobilizers often ask audiences to set an alarm for 10:02 to pray Luke 10:2, asking the Lord of the harvest to send out workers. You can get a jump on them by praying at 9:38, per Matthew 9:38 which says much the same. Or hey, what about this… get a clock, remove the battery, set it for 10:02 or 9:38, and pray whenever you see it!
Whether you use a fancy app, a phone alarm, a clock, a fridge magnet, or just a Post-it note, thanks for praying. What a privilege to partner with the maker of the universe as he carries out his global purposes.